friendica/include/email.php

<?php

function email_connect($mailbox,$username,$password) {
	if(! function_exists('imap_open'))
		return false;

	$mbox = @imap_open($mailbox,$username,$password);

	return $mbox;
}

function email_poll($mbox,$email_addr) {

	if(! ($mbox && $email_addr))
		return array();

	$search1 = @imap_search($mbox,'FROM "' . $email_addr . '"', SE_UID);
	if(! $search1)
		$search1 = array();

	$search2 = @imap_search($mbox,'TO "' . $email_addr . '"', SE_UID);
	if(! $search2)
		$search2 = array();

	$search3 = @imap_search($mbox,'CC "' . $email_addr . '"', SE_UID);
	if(! $search3)
		$search3 = array();

	$search4 = @imap_search($mbox,'BCC "' . $email_addr . '"', SE_UID);
	if(! $search4)
		$search4 = array();

	$res = array_unique(array_merge($search1,$search2,$search3,$search4));

	return $res;
}


function construct_mailbox_name($mailacct) {
	$ret = '{' . $mailacct['server'] . ((intval($mailacct['port'])) ? ':' . $mailacct['port'] : '');
	$ret .= (($mailacct['ssltype']) ?  '/' . $mailacct['ssltype'] . '/novalidate-cert' : '');
	$ret .= '}' . $mailacct['mailbox'];
	return $ret;
}


function email_msg_meta($mbox,$uid) {
	$ret = (($mbox && $uid) ? @imap_fetch_overview($mbox,$uid,FT_UID) : array(array()));
	return ((count($ret)) ? $ret[0] : array());
}

function email_msg_headers($mbox,$uid) {
	$raw_header = (($mbox && $uid) ? @imap_fetchheader($mbox,$uid,FT_UID) : '');
	$raw_header = str_replace("\r",'',$raw_header);
	$ret = array();
	$h = split("\n",$raw_header);
	if(count($h))
	foreach($h as $line ) {
	    if (preg_match("/^[a-zA-Z]/", $line)) {
			$key = substr($line,0,strpos($line,':'));
			$value = substr($line,strpos($line,':')+1);

			$last_entry = strtolower($key);
			$ret[$last_entry] = trim($value);
		}
		else {
			$ret[$last_entry] .= ' ' . trim($line);
    	}
	}
	return $ret;
}


function email_get_msg($mbox,$uid) {
	$ret = array();

	$struc = (($mbox && $uid) ? @imap_fetchstructure($mbox,$uid,FT_UID) : null);

	if(! $struc)
		return $ret;

	if(! $struc->parts) {
		$ret['body'] = email_get_part($mbox,$uid,$struc,0);
	}
	else {
		foreach($struc->parts as $ptop => $p) {
			$x = email_get_part($mbox,$uid,$p,$ptop + 1);
			if($x)
				$ret['body'] = $x;
		}
	}
	return $ret;
}

// At the moment - only return plain/text.
// Later we'll repackage inline images as data url's and make the HTML safe

function email_get_part($mbox,$uid,$p,$partno) {
    // $partno = '1', '2', '2.1', '2.1.3', etc for multipart, 0 if simple
    global $htmlmsg,$plainmsg,$charset,$attachments;

	echo $partno;

    // DECODE DATA
    $data = ($partno)
		? @imap_fetchbody($mbox,$uid,$partno, FT_UID|FT_PEEK)
        : @imap_body($mbox,$uid,FT_UID|FT_PEEK);

    // Any part may be encoded, even plain text messages, so check everything.
    if ($p->encoding==4)
        $data = quoted_printable_decode($data);
    elseif ($p->encoding==3)
        $data = base64_decode($data);

    // PARAMETERS
    // get all parameters, like charset, filenames of attachments, etc.
    $params = array();
    if ($p->parameters)
        foreach ($p->parameters as $x)
            $params[strtolower($x->attribute)] = $x->value;
    if ($p->dparameters)
        foreach ($p->dparameters as $x)
            $params[strtolower($x->attribute)] = $x->value;

    // ATTACHMENT
    // Any part with a filename is an attachment,
    // so an attached text file (type 0) is not mistaken as the message.

    if ($params['filename'] || $params['name']) {
        // filename may be given as 'Filename' or 'Name' or both
        $filename = ($params['filename'])? $params['filename'] : $params['name'];
        // filename may be encoded, so see imap_mime_header_decode()
        $attachments[$filename] = $data;  // this is a problem if two files have same name
    }

    // TEXT
    if ($p->type == 0 && $data) {
        // Messages may be split in different parts because of inline attachments,
        // so append parts together with blank row.
        if (strtolower($p->subtype)=='plain')
            return (trim($data) ."\n\n");
        else
			$data = '';

 //           $htmlmsg .= $data ."<br><br>";
        $charset = $params['charset'];  // assume all parts are same charset
    }

    // EMBEDDED MESSAGE
    // Many bounce notifications embed the original message as type 2,
    // but AOL uses type 1 (multipart), which is not handled here.
    // There are no PHP functions to parse embedded messages,
    // so this just appends the raw source to the main message.
//    elseif ($p->type==2 && $data) {
//        $plainmsg .= $data."\n\n";
//    }

    // SUBPART RECURSION
    if ($p->parts) {
        foreach ($p->parts as $partno0=>$p2) {
            $x =  email_get_part($mbox,$uid,$p2,$partno . '.' . ($partno0+1));  // 1.2, 1.2.1, etc.
			if($x)
				return $x;
		}
    }
}



function email_header_encode($in_str, $charset) {
    $out_str = $in_str;
    if ($out_str && $charset) {

        // define start delimimter, end delimiter and spacer
        $end = "?=";
        $start = "=?" . $charset . "?B?";
        $spacer = $end . "\r\n " . $start;

        // determine length of encoded text within chunks
        // and ensure length is even
        $length = 75 - strlen($start) - strlen($end);

        /*
            [EDIT BY danbrown AT php DOT net: The following
            is a bugfix provided by (gardan AT gmx DOT de)
            on 31-MAR-2005 with the following note:
            "This means: $length should not be even,
            but divisible by 4. The reason is that in
            base64-encoding 3 8-bit-chars are represented
            by 4 6-bit-chars. These 4 chars must not be
            split between two encoded words, according
            to RFC-2047.
        */
        $length = $length - ($length % 4);

        // encode the string and split it into chunks
        // with spacers after each chunk
        $out_str = base64_encode($out_str);
        $out_str = chunk_split($out_str, $length, $spacer);

        // remove trailing spacer and
        // add start and end delimiters
        $spacer = preg_quote($spacer);
        $out_str = preg_replace("/" . $spacer . "$/", "", $out_str);
        $out_str = $start . $out_str . $end;
    }
    return $out_str;
}